Elevatoe



(No Model.) 2 Sheets--Sheet 1. I. H. VENN.

ELEVATOR. No. 580,167. PatentedApr. 6, 1897.

(No Model.) 2 Sheets-Sheet 2.

I. H.. VE-NN. ELEVATOR.

No. 580.167. Patented Apr. 6, 1897.

q vi fweweo v awva'wtoz v j 1,1 M 9- UNITE STATES PATENT OFFICE.

ISAAC H. VENN, or YONKERS, NEW YORK, ASSIGNOR To THE .orrs' f BROTHERS & COMPANY, OF NEW YORK, N. Y. i

ELEVATOR.

SPECIFICATION forming part Of Letters Iatent NO. 580,167, dated April 6, 1897.

Application filed July 18, 1893. Serial No. 480,862. (N model.) 7 I To all whom it may concern.-

Be it known that I, ISAAC H. VENN, a citizen of the United States, residingat Yonkers,

- in the county of Westchester and State of New York, have invented certainnew and useful Improvements in Elevators, of which the following is a specification.

My invention relates to certain improvemen ts in that class of elevating apparatus in which the cage is raised and lowered by winding a cable upon or unwinding it from a winding-drum; and my invent-ion consists in the combination, with the suspensory cable and a sheave carried thereby, of a difierential winding-drum and of an endless cable, as fully set forth hereinafter and as illustrated in the accompanying drawings, in which Figure 1 is a side view of an elevating apparatus, illustrating my improvements, the guide-sheaves and cables being arranged so as to best show the arrangement of the cables in somewhat difierent relations from that which they would occupy in actual practice. Fig. 2 is an edge view of the winding-drum. Fig. 3 is a side view showing the parts in a different position, the winding-drum being differentlyconstructed; and Fig. 4 is an edge view of the winding-drum, Fig. 3.

The cage or platform X of the elevator moves, as usual, between suitable guides and iszoperated by means of a Winding-engine of any suitable character, either hydraulic, steam, or'electric, or belt, as may be required.

Whatever the character of the motor-power may be, A represents the driving-shaft of the engine, connected with a winding-drum E, which is diiferential in its character, that is, consisting of two sections 12 13, each provided with a groove or otherwise constructed to receive the winding-cableand of difierent diameters.

To the cage X is connected a suspension.- cable 5, which passes over guide-pulleys 6 6 and has attached to its other end a sheave C.

W represents a weight which may be guided.

sheaves 0 10 atthe top of the well passes an endless rope, chain, or cable D. 1

Assuming that the cableD passes from the smaller sheave 12 of the diiferential'wiudingdrum E at the point x, it then extends upward and over the sheave C and downward to the larger sheave 13 of the winding-drum, beneath the latter, upward over the sheave 9, down beneath the sheave 15 of the weight \V, up over the sheave 10, and down to the sheave 12 and beneath the latter and to the point so. As thus arranged the eflect of the revolution of the winding-drum E will be to take up upon the sheave 13 of the said drum so much of the cable as is paid out from the sheave 12, and in addition an amountequal to the excess in the circumference of the sheave 13 to the sheave 12, so that at each f 4 revolution of the winding-drum there is a practical draft upon the cable D, tending to draw down the sheave C, equal in extent to the difference between the circumferences of the two sections of the differential drum. At the same time there is paid out from the sheave 13 toward a weight w a correspondingly greater amount of cable than is taken up by the sheave 12, so that the weight is lowered to an extent corresponding to that to which the cage is raised. By this means I secure a very steady, uniform, and even movement of the elevator-cage. I effectually counterbalance the same at all times, so that should there be anybrcak in the motor machinery connected with the shaft A there would be no liability of the cage or the weight running down, the intermediate connectingcables practically locking the parts in place, and even should the cable supporting the weight break at any point between the winding-drum and weight unless the cable should upon the cable by a drum arranged directly on a rapidly-rotating shaft, as the shaft carryjng or connected with the armature of an electromotor, which may be driven without any reducing-gearing atany required speed. It will further be evident that there is less friction where, as above described, the cable extends to both sides of the winding drums or pulleys than when they extend from one side only, and the drum is balanced so as to respond better to the initial movements of an armature. v

The requisiteadhesion of the cable D to the sections of the winding-drum may be secured by providing said sections with V- shaped grooves, as shown in Figs. 1 and 2; but as in some cases this would resultu'n too great a wearing of the cable the said sections may have curved faces, as shown in Fig. 4, upon which the cable will wind itself, one or two winds of the cable being placed upon each section to secure friction and prevent ready unwinding in case of accident.

It will be evident that there may be any desired difierence between the sizes of the sections l2 13 of the winding-drum, and that three or more sections may be used, if -required, and that the cable may be in multiple wind upon the different sections, the sheave C in such case being proportioned or having a number of grooves adapted to receive the extra number of windings.

It will also be evidentrthat instead of the sheave 15 being connected to a moving weight it may be connected to the bottom of the cage,

with the cable I) passing around suitable guide-sheaves, as illustrated in dotted lines, Fig. l.

It must be understood that the weight XV is not a counterweight, but is merely of sufficientweight to maintain the cables taut, no

weight being necessary, as in ordinary modes of supporting and operating cars and cables, the latter in my construction locking the cage in position at all times. Of course a counterweight can be used, as usual, to counterbalance the car to reduce the power required for lifting.

\Vithout limiting myself to the precise con struction and arrangement of parts shown, I

drum arranged below the suspensory cable,

and means for operating said drum, an endlessdriving-cablepassing around said drum and upward to and around said sheave, and a weighted sheave hanging in a loop of the driving-cable, substantially as set forth.

2. The combination with the cage, the suspensory cable therefor, anda sheave O attached to the cable, of a winding-drum having differential sections or sheaves, below the sheave C, guide-sheaves, a' weighted sheave, and an endless driving-cable passing around the differential sections of the winding-drum, the suspensory cable sheave, the guidesheaves and the weighted sheave to directly act on the suspensory cable to elevate or lower the cage, substantially as set forth.

3. The combination with the cage, the suspensory cable therefor, and sheave attached thereto, of a windingdrum having differential sections or sheaves, guide-sheaves, a weighted sheave and an endless cable, said cable passing around the suspensory sheave,

one of the differential-drum sheaves, one of the guide-sheaves, the weighted sheave, back to the other guide-sheave and to the second differential-din msheave, substantially as set forth.

4. The combination of the cage, suspensor Y cable 5, sheave C, differential winding drum and cable D means for taking up the cable and a motor-engine having its driving-shaft directly coupled with the shaft of the winding-drum, substantially as and for the purpose set forth.

ii: testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ISAAC lEl. VENN. \Vitnesses:

JAMES S. FITCH, J our: J. SPEIGHT. 

